[RKOTLIN-1115] Add support for switching user

CHANGELOG.md

@@ -4,7 +4,7 @@
 * None.
 
 ### Enhancements
-* None.
+* [Sync] Add support for switching users with `App.switchUser(User)`. (Issue [#1813](https://github.com/realm/realm-kotlin/issues/1813)/[RKOTLIN-1115](https://jira.mongodb.org/browse/RKOTLIN-1115)).
 
 ### Fixed
 * None.

packages/cinterop/src/commonMain/kotlin/io/realm/kotlin/internal/interop/RealmInterop.kt

@@ -529,6 +529,7 @@ expect object RealmInterop {
     fun realm_app_remove_user(app: RealmAppPointer, user: RealmUserPointer, callback: AppCallback<Unit>)
     fun realm_app_delete_user(app: RealmAppPointer, user: RealmUserPointer, callback: AppCallback<Unit>)
     fun realm_app_link_credentials(app: RealmAppPointer, user: RealmUserPointer, credentials: RealmCredentialsPointer, callback: AppCallback<RealmUserPointer>)
+    fun realm_app_switch_user(app: RealmAppPointer, user: RealmUserPointer)
     fun realm_clear_cached_apps()
     fun realm_app_sync_client_get_default_file_path_for_realm(
         syncConfig: RealmSyncConfigurationPointer,

packages/cinterop/src/jvm/kotlin/io/realm/kotlin/internal/interop/RealmInterop.kt

@@ -1201,6 +1201,10 @@ actual object RealmInterop {
         realmc.realm_app_link_user(app.cptr(), user.cptr(), credentials.cptr(), callback)
     }
 
+    actual fun realm_app_switch_user(app: RealmAppPointer, user: RealmUserPointer) {
+        realmc.realm_app_switch_user(app.cptr(), user.cptr())
+    }
+
     actual fun realm_app_get_current_user(app: RealmAppPointer): RealmUserPointer? {
         val ptr = realmc.realm_app_get_current_user(app.cptr())
         return nativePointerOrNull(ptr)

packages/cinterop/src/nativeDarwin/kotlin/io/realm/kotlin/internal/interop/RealmInterop.kt

@@ -2357,6 +2357,10 @@ actual object RealmInterop {
         )
     }
 
+    actual fun realm_app_switch_user(app: RealmAppPointer, user: RealmUserPointer) {
+        checkedBooleanResult(realm_wrapper.realm_app_switch_user(app.cptr(), user.cptr()))
+    }
+
     actual fun realm_clear_cached_apps() {
         realm_wrapper.realm_clear_cached_apps()
     }

packages/library-sync/src/commonMain/kotlin/io/realm/kotlin/mongodb/App.kt

@@ -121,6 +121,15 @@ public interface App {
      */
     public suspend fun login(credentials: Credentials): User
 
+    /**
+     * Switch current user.
+     *
+     * @param user the user that should be the new current user. The user must be one of the users
+     * that are already logged in.
+     * @throws IllegalStateException If the [user] is not logged in.
+     */
+    public fun switchUser(user: User)
+
     /**
      * Create a [Flow] of [AuthenticationChange]-events to receive notifications of updates to all
      * app user authentication states: login, logout and removal.

packages/library-sync/src/commonMain/kotlin/io/realm/kotlin/mongodb/internal/AppImpl.kt

@@ -163,6 +163,11 @@ public class AppImpl(
         }
     }
 
+    override fun switchUser(user: User) {
+        Validation.isType<UserImpl>(user)
+        RealmInterop.realm_app_switch_user(this.nativePointer, user.nativePointer)
+    }
+
     internal fun reportAuthenticationChange(user: User, change: User.State) {
         val event: AuthenticationChange = when (change) {
             User.State.LOGGED_OUT -> LoggedOutImpl(user)

packages/test-sync/src/commonTest/kotlin/io/realm/kotlin/test/mongodb/common/AppTests.kt

@@ -62,6 +62,7 @@ import kotlin.test.assertNotEquals
 import kotlin.test.assertNull
 import kotlin.test.assertSame
 import kotlin.test.assertTrue
+import kotlin.test.fail
 
 class AppTests {
 
@@ -210,30 +211,30 @@ class AppTests {
         assertTrue(app.allUsers().isEmpty())
     }
 
-//    @Test
-//    fun switchUser() {
-//        val user1: User = app.login(Credentials.anonymous())
-//        assertEquals(user1, app.currentUser())
-//        val user2: User = app.login(Credentials.anonymous())
-//        assertEquals(user2, app.currentUser())
-//
-//        assertEquals(user1, app.switchUser(user1))
-//        assertEquals(user1, app.currentUser())
-//    }
-//
-//    @Test
-//    fun switchUser_throwIfUserNotLoggedIn() = runBlocking {
-//        val user1 = app.login(Credentials.anonymous())
-//        val user2 = app.login(Credentials.anonymous())
-//        assertEquals(user2, app.currentUser)
-//
-//        user1.logOut()
-//        try {
-//            app.switchUser(user1)
-//            fail()
-//        } catch (ignore: IllegalArgumentException) {
-//        }
-//    }
+    @Test
+    fun switchUser() = runBlocking {
+        val user1: User = app.login(Credentials.anonymous())
+        assertEquals(user1, app.currentUser)
+        val user2: User = app.login(Credentials.anonymous())
+        assertEquals(user2, app.currentUser)
+
+        app.switchUser(user1)
+        assertEquals(user1, app.currentUser)
+    }
+
+    @Test
+    fun switchUser_throwIfUserNotLoggedIn() = runBlocking {
+        val user1 = app.login(Credentials.anonymous())
+        val user2 = app.login(Credentials.anonymous())
+        assertEquals(user2, app.currentUser)
+
+        user1.logOut()
+        try {
+            app.switchUser(user1)
+            fail()
+        } catch (ignore: IllegalStateException) {
+        }
+    }
 
     @Test
     fun currentUser_FallbackToNextValidUser() = runBlocking {
@@ -262,21 +263,6 @@ class AppTests {
         assertNull(app.currentUser)
     }
 
-//    @Test
-//    fun switchUser_nullThrows() {
-//        try {
-//            app.switchUser(TestHelper.getNull())
-//            fail()
-//        } catch (ignore: IllegalArgumentException) {
-//        }
-//    }
-//
-//    @Ignore("Add this test once we have support for both EmailPassword and ApiKey Auth Providers")
-//    @Test
-//    fun switchUser_authProvidersLockUsers() {
-//        TODO("FIXME")
-//    }
-//
     @Test
     fun authenticationChangeAsFlow() = runBlocking<Unit> {
         val c = TestChannel<AuthenticationChange>()

packages/test-sync/src/commonTest/kotlin/io/realm/kotlin/test/mongodb/common/FunctionsTests.kt

@@ -1020,7 +1020,7 @@ class FunctionsTests {
         runBlocking {
             anonUser.logOut()
         }
-        assertFailsWithMessage<ServiceException>("[Service][Unknown(4351)] unauthorized") {
+        assertFailsWithMessage<ServiceException>("unauthorized") {
             runBlocking {
                 functions.call(FIRST_ARG_FUNCTION.name, 1, 2, 3)
             }